70 percent of Reddit users get news from that platform, and that also goes for 66 percent of Facebook users and 59 percent of Twitter users.

26 percent of respondents get news from two social networks, and just 10 percent do so from three or more.

Pew said in its report:

Facebook is by far the largest social networking site, reaching 67 percent of U.S. adults. The two-thirds of Facebook users who get news there, then, amount to 44 percent of the general population. YouTube has the next greatest reach in terms of general usage, at 48 percent of U.S. adults. But only about one-fifth of its users get news there, which amounts to 10 percent of the adult population. That puts it on par with Twitter, which has a smaller user base (16 percent of U.S. adults) but a larger portion getting news there.

Differences also emerge in how active or passive each group of news users is in their online news habits more generally. YouTube, Facebook and Instagram news users are more likely to get their news online mostly by chance, when they are online doing other things. Alternatively, the portion of Reddit, Twitter and LinkedIn news users who seek out news online is roughly similar to the portion that happen upon it.

Readers: What did you think of the findings by Pew and the Knight Foundation?